[PATCH 1/2] x86: PadLock adjustments

[Jan Beulich]

On 26.09.2025 14:57, Jan Beulich wrote:
> For one, all PadLock insns depend on CR4.FXSR to be enabled, which means
> they ought to be taking FXSR as a prereq.
> 
> Furthermore none of them permits a REPNE prefix; such forms are documented
> to cause #UD. (This is mainly relevant for XSTORE, which doesn't include a
> REP prefix in its base encoding. For the others this merely is a change in
> what diagnostic is issued.)
> 
> Finally it is documented that an operand size prefix also causes #UD.
> ---
> Question is whether for the GMI insns the data size prefix is invalid as
> well.

Can you possibly answer this?

Thanks, Jan